Alarm clock



FIG. 1 is a bottom view of an alarm clock;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a first perspective view thereof;

FIG. 5 is a second perspective view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a right view thereof; and,

FIG. 8 is a top view thereof.

The broken lines in the drawings show portions of the alarm clock that form no part of the claimed design. 

CLAIM The ornamental design for an alarm clock, as shown and described. 